Reactor vessel



FIG. 1 is a front perspective view of a reactor vessel;

FIG. 2 is a front view of the design of FIG. 1;

FIG. 3 is a right-hand side view of the design of FIG. 1;

FIG. 4 is a rear view of the design of FIG. 1;

FIG. 5 is a left-hand side view of the design of FIG. 1;

FIG. 6 is a top view of the design of FIG. 1; and,

FIG. 7 is a bottom view of the design of FIG. 1. 

CLAIM I claim the ornamental design for a reactor vessel, as shown and described. 